20 Most Recent Mcintosh MC602 2-Channel Amplifier Questions & Answers

Welcome to Fixya! Not totally sure But, You said that it worked Fine Except for the Lights? If So, Replace with 12 Volt L.E.D. Bulbs and see how it works. If not Give me some more Info so we can Troubleshoot a Little Further!

it seems that the right channel is blown. the unit has no fuses inside, most likelly output transistors are gone. not easy fixable, you need to bring it to a repair shop. if you are in nj you may brong to ebcelectronics

Try this link,

http://akdatabase.org/AKview/albums/userpics/10004/MC602%20Owners.PDF

Scroll down to the top of page 8.

Sheilah

Yes you could be right about the power supply capacitors as they have a tendency to dry out. Another tip is to inspect the terminations of these capacitors and clean their contact points as often the screw and screw boss is a different metal and corrosion and electrolysis occurs between these and the main power supply connectors. If in doubt clean with a scotch scourer till shiny metal is exposed on connection points. Then coat contacts with electrical contact conditioner (lanolin grease is good too) before reassembly.

Some amplifiers do not have sufficient storage to sustain high bass levels into difficult speaker loads, the Mac should not be one of these however . To verify that your dedicated AC outlet is not a limiting factor - use a power board and plug an incandescent lamp into the same point as the amp and see if you see any flickering of lamp when the amp lights dim.

If no evidence of limiting of main power and connection maitenance does not solve the issue, replacing the capacitors is indicated.

is output amplifier is burned, check any burned fuse on the back. is high cmos power amplifier, need to be repaired. send to your top audio repair center.

These units are capacitor coupled between stages. It sound to me like one or more of those caps are defective. There is an extra stage of amplification for the Phono inputs. Check the phono pre-amp section for defective caps. Dan

Contact McIntosh.

The good thing about stereo amps are they are actually two mono amps joined together. So when there's a fault in one channel you have the other channel to compare it too. For example the voltages should be the same. You can also touch the working parts with an insulated tool. When you do it will buzz in the channels in places. So if it buzzers in the good channel in a certain place then it should in the bad in the same place. You can search backwoods or forwards to determine where the signal is lost in the bad channel. It should take you to the culprit part. Don't bother with the power supply parts as they are common to both channels. Just buzz test the bad channel and compare with the good.

You will be safe to use any as long as the voltage specs are higher than any in the circuit around them or any stated voltages on the diagram. It will probably a question of the space needed to fit them in the end rather than the working voltages. For example if everything around it is marked 50 volts, than that or above, should be OK.

prob just a burnt fuse, could be in protect mode.......... need more info, it's not just you but alot of ppl are not giving enough info to determine the problem since it could be a number of things

Hi there: You directed this question at me, but unfortunately this isn't my expertise and I am unable to provide you with a real solution at this time. Hopefully one of other experts will be able to provide you with a real solution. Thank you for using FixYa